1. Physiological responses to local heat gain or loss;Hecox,1994
2. Therapeutic heat;Lehmann,1990
3. Pain threshold measurements after therapeutic application of ultrasound, microwaves and infrared;Lehmann;Arch Phys Med Rehabil,1958
4. Pain mechanisms: a new theory;Melzack;Science,1965
5. Studies on the relief of pain by counterirritation;Gomman;J Clin Invest,1941